Minor improvement to OTLP exporter internal logs/events

[cijothomas]

Change Summary

Applied suggestion from #1987

Are there any user-facing changes?

Yes, less expensive logs, without losing information!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.23%. Comparing base (5cdec9c) to head (5320706).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2005      +/-   ##
==========================================
- Coverage   86.23%   86.23%   -0.01%     
==========================================
  Files         525      525              
  Lines      164810   164812       +2     
==========================================
- Hits       142127   142125       -2     
- Misses      22149    22153       +4     
  Partials      534      534              

Components	Coverage Δ
otap-dataflow	88.22% <100.00%> (-0.01%)	⬇️
query_abstraction	80.61% <ø> (ø)
query_engine	90.23% <ø> (ø)
syslog_cef_receivers	∅ <ø> (∅)
otel-arrow-go	53.50% <ø> (ø)
quiver	92.15% <ø> (ø)

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